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Overburden-induced flattening structure in the Himalaya: mechanism and implication

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Title Overburden-induced flattening structure in the Himalaya: mechanism and implication
 
Creator BANERJEE, S
MATIN, A
MUKUL, M
 
Subject FOLD-THRUST-BELT
LESSER-HIMALAYA
TECTONIC EVOLUTION
SHUMAR ALLOCHTHON
CONTINENTAL-CRUST
SIKKIM HIMALAYA
EASTERN BHUTAN
RANGIT DUPLEX
WESTERN NEPAL
UNITED-STATES
Orogeny
overburden-induced flattening
recumbent fold
thrust sheet
 
Description Small-scale structures in fold-thrust belt are mainly formed in response to the emplacement of thrust sheets. However, some small-scale structures may not be developed directly in response to the emplacement of thrust sheets, but might be genetically tied with the orogenic process. Metre-to centimetre-scale late-stage folds on foliation in phyllite with near-recumbent fold geometry are selectively developed with a specific spatial distribution, particularly in places where the foliation is steeply dipping, in the Ramgarh thrust sheet in the Darjiling-Sikkim Himalaya. The recumbent-fold structures appear to have been formed in response to overburden-induced vertical compressive deformation on steep dipping foliation, especially in the sub-vertical southern limb of the antiformal structure of the Lesser Himalayan Duplex in the Darjiling-Sikkim Himalaya. The role of gravity and overburden in the formation of these structures from worldwide orogenic belts may be considered to validate their genesis.
 
Publisher INDIAN ACAD SCIENCES
 
Date 2016-01-15T11:04:54Z
2016-01-15T11:04:54Z
2015
 
Type Article
 
Identifier CURRENT SCIENCE, 109(10)1814-1821
0011-3891
http://dspace.library.iitb.ac.in/jspui/handle/100/18419
 
Language en